Hi there,
Im using UCC28711 based flyback converter for one of our application.The requirement is as follows
1. The Input voltage range is 30VDC to 90VDC (the turn on voltage is 30V)
2.It has 3 outputs 15V, 5V and 5V,
2a. 200mA , 200mA, 200mA Current respectively
3.We are using auxiliary winding output for 15V output .
4.The output rating is 6W.
We are not able to get proper document/reference for designing multiple output converter with UCC28711.
we used tiduag6a.pdf
We are facing some problem with our design .
1.The 15V seems to go out of regulation at Vin >60V .(but seems to be working fine for Vin<60)
2.Can we use Aux winding for tapping 15V (is separate winding needed).
3.Can you please suggest some reference design.
Im attaching our design calculation and schematic . Copy of Design Specification (002).pdf
